<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--action设置提交地址-->
<form action="http://www.tmooc.cn">
  <!--placeholder 站位文本 value 设置默认值 maxlength 最大字符长度-->
  用户名:<input type="text" name="username" value="Jack" maxlength="8"
             placeholder="请输入用户名" readonly><br>
  密码:<input type="password" name="password" placeholder="请输入密码"><br>
  <!--单选框中value必须写 不写则提交on checked设置默认选中-->
  性别:<input type="radio" name="gender" value="m" id="r1"><label for="r1">男</label>
   <input type="radio" name="gender" checked value="w" id="r2"><label for="r2">女</label><br>
  兴趣爱好:<input type="checkbox" name="hobby" value="cy">抽烟
          <input type="checkbox" name="hobby" checked value="hj">喝酒
          <input type="checkbox" name="hobby" value="tt">烫头<br>
  生日:<input type="date" name="birthday"><br>
  靓照:<input type="file" name="pic"><br>
  所在地: <select name="city">
              <option value="gz">广州</option>
              <!--selected设置默认选中-->
              <option value="sh" selected>上海</option>
              <option value="bj">北京</option>
        </select><br>
  <input type="submit" name="注册">
  <!--重置按钮-->
  <input type="reset">
  <!--自定义按钮-->
  <input type="button" value="自定义按钮">
  <button type="submit">提交</button>
  <button type="reset">重置</button>
  <button type="button">自定义按钮</button>
</form>

</body>
</html>